check in v3.8.1 source

crypto/bio/b_print.c

@@ -0,0 +1,111 @@
+/* $OpenBSD: b_print.c,v 1.27 2023/07/05 21:23:37 beck Exp $ */
+
+/* Theo de Raadt places this file in the public domain. */
+
+#include <openssl/bio.h>
+
+int
+BIO_printf(BIO *bio, const char *format, ...)
+{
+	va_list args;
+	int ret;
+
+	va_start(args, format);
+	ret = BIO_vprintf(bio, format, args);
+	va_end(args);
+	return (ret);
+}
+LCRYPTO_ALIAS(BIO_printf);
+
+#ifdef HAVE_FUNOPEN
+static int
+_BIO_write(void *cookie, const char *buf, int nbytes)
+{
+	return BIO_write(cookie, buf, nbytes);
+}
+
+int
+BIO_vprintf(BIO *bio, const char *format, va_list args)
+{
+	int ret;
+	FILE *fp;
+
+	fp = funopen(bio, NULL, &_BIO_write, NULL, NULL);
+	if (fp == NULL) {
+		ret = -1;
+		goto fail;
+	}
+	ret = vfprintf(fp, format, args);
+	fclose(fp);
+fail:
+	return (ret);
+}
+LCRYPTO_ALIAS(BIO_vprintf);
+
+#else /* !HAVE_FUNOPEN */
+
+int
+BIO_vprintf(BIO *bio, const char *format, va_list args)
+{
+	int ret;
+	char *buf = NULL;
+
+	ret = vasprintf(&buf, format, args);
+	if (ret == -1)
+		return (ret);
+	BIO_write(bio, buf, ret);
+	free(buf);
+	return (ret);
+}
+LCRYPTO_ALIAS(BIO_vprintf);
+
+#endif /* HAVE_FUNOPEN */
+
+/*
+ * BIO_snprintf and BIO_vsnprintf return -1 for overflow,
+ * due to the history of this API.  Justification:
+ *
+ * Traditional snprintf surfaced in 4.4BSD, and returned
+ * "number of bytes wanted". Solaris and Windows opted to
+ * return -1.  A draft standard was written which returned -1.
+ * Due to the large volume of code already using the first
+ * semantics, the draft was repaired before standardization to
+ * specify "number of bytes wanted" plus "-1 for character conversion
+ * style errors".  Solaris adapted to this rule, but Windows stuck
+ * with -1.
+ *
+ * Original OpenSSL comment which is full of lies:
+ *
+ * "In case of truncation, return -1 like traditional snprintf.
+ * (Current drafts for ISO/IEC 9899 say snprintf should return
+ * the number of characters that would have been written,
+ * had the buffer been large enough.)"
+ */
+int
+BIO_snprintf(char *buf, size_t n, const char *format, ...)
+{
+	va_list args;
+	int ret;
+
+	va_start(args, format);
+	ret = vsnprintf(buf, n, format, args);
+	va_end(args);
+
+	if (ret >= n || ret == -1)
+		return (-1);
+	return (ret);
+}
+LCRYPTO_ALIAS(BIO_snprintf);
+
+int
+BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args)
+{
+	int ret;
+
+	ret = vsnprintf(buf, n, format, args);
+
+	if (ret >= n || ret == -1)
+		return (-1);
+	return (ret);
+}
+LCRYPTO_ALIAS(BIO_vsnprintf);